The role of bacteria in the formation of cold seep carbonates: geological evidence from Monferrato (Tertiary, NW Italy)

Cavagna, Simona; Clari, Pierangelo; Martire, Luca

doi:10.1016/s0037-0738(99)00044-5

Cited by 118 publications

(80 citation statements)

References 37 publications

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“…Unlike the pre-MSC beds, the carbonate fraction of the salinity crisis layers is dominated by 315 calcite whereas dolomite is subordinate; frequently micron-sized calcite crystals show a globular 316 shape with a central hollow, suggesting a possible microbial origin (Cavagna et al, 1999). This type 317 of crystals ( Fig.…”

Section: Msc Carbonate-rich Beds 293mentioning

confidence: 97%

Messinian carbonate-rich beds of the Tertiary Piedmont Basin (NW Italy): Microbially-mediated products straddling the onset of the salinity crisis

Pierre

Clari

Bernardi

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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Section: Msc Carbonate-rich Beds 293mentioning

confidence: 97%

Messinian carbonate-rich beds of the Tertiary Piedmont Basin (NW Italy): Microbially-mediated products straddling the onset of the salinity crisis

Pierre

Clari

Bernardi

et al. 2012

Palaeogeography, Palaeoclimatology, Palaeoecology

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“…Staining technique would be a useful mineral identification and/or separation to carbonate cementations composed of multi-carbonate mineral phases coexisting with chemosynthesis fossils of molluses that is originated to cold seepage and appears on land (i.e., Cavagna et al, 1999). They include a few carbonate mineral assemblages such as calcite, aragonite, and dolomite in the sediment.…”

Section: Discussionmentioning

confidence: 99%

“…Despite these constraints, carbonates deposits where calcite, aragonite, and dolomite coexist are commonly observed and suggest the presence of different chemical conditions during the precipitation of each mineral. Ancient examples of carbonate cements are the result of cold seepage in geologic record and can be composed of calcite, aragonite, and dolomite (i.e., Cavagna et al, 1999). ganic marine carbonate deposits because commonly they contained a fine-grained assemblage of different carbonates.…”

Section: Introductionmentioning

confidence: 99%

The application of chemical staining to separate calcite and aragonite minerals for micro-scale isotopic analyses.

Kato

Wada

Fujioka³

2003

Geochem. J.

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Staining is a useful laboratory tool for distinguishing specific carbonate minerals from a mixture of carbonates. Feigl's and Meigen's solutions are commonly used to distinguish aragonite from other carbonates. Feigl's solution stains the aragonite surface black and Meigen's stains purple, whereas the coexisting calcite remains nochang in color with either solutions. Both methods were applied to an authigenically precipitated carbonate chimney and a recrystallized metamorphic marble. Meigen's solution was favorable to stain fine and euhedral aragonites, but not effective for recrystallized aragonites. Feigl's solution was applicable to identify both types of aragonites.As a sample that demonstrates application of the Meigen's solution, isotopic analyses were carried out on aragonite and calcite separated from the seepage carbonate chimney collected from the Conical seamount of the Mariana forearc.

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“…Authigenic carbonates deposits have been documented in area near methane seep in both the active and passive continental margin [5,6]. The carbonates formation relates closely to methane seep or gas hydrate decomposition because of their special microstructure [2,35]. The Southeast Hainan Basin in South China Sea is a potential area for gas hydrate reservoirs.…”

Section: Authigenic Minerals and Microstructures Of Sedimentsmentioning

confidence: 99%

Early Diagenesis Records and Pore Water Composition of Methane-Seep Sediments from the Southeast Hainan Basin, South China Sea

et al. 2011

Journal of Geological Research

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Several authigenic minerals were identified by XRD and SEM analyses in shallow sediments from the Southeast Hainan Basin, on the northern slope of South China Sea. These minerals include miscellaneous carbonates, sulphates, and framboidal pyrite, and this mineral assemblage indicates the existence of gas hydrates and a methane seep. The assemblage and fabric features of the minerals are similar to those identified in cold-seep sediments, which are thought to be related to microorganisms fostered by dissolved methane. Chemical composition of pore water shows that the concentrations of SO 2− 4 , Ca 2+ , Mg 2+ , and Sr 2+ decrease clearly, and the ratios of Mg 2+ to Ca 2+ and Sr 2+ to Ca 2+ increase sharply with depth. These geochemical properties are similar to those where gas hydrates occur in the world. All results seem to indicate clearly the presence of gas hydrates or deep water oil (gas) reservoirs underneath the seafloor.

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The role of bacteria in the formation of cold seep carbonates: geological evidence from Monferrato (Tertiary, NW Italy)

Cited by 118 publications

References 37 publications

Messinian carbonate-rich beds of the Tertiary Piedmont Basin (NW Italy): Microbially-mediated products straddling the onset of the salinity crisis

Messinian carbonate-rich beds of the Tertiary Piedmont Basin (NW Italy): Microbially-mediated products straddling the onset of the salinity crisis

The application of chemical staining to separate calcite and aragonite minerals for micro-scale isotopic analyses.

Early Diagenesis Records and Pore Water Composition of Methane-Seep Sediments from the Southeast Hainan Basin, South China Sea

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